CN104615561A - Optical interconnection transmission system on sheet or between plates based on multiple-input-multiple-output technique - Google Patents

Optical interconnection transmission system on sheet or between plates based on multiple-input-multiple-output technique Download PDF

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Publication number
CN104615561A
CN104615561A CN201410844296.5A CN201410844296A CN104615561A CN 104615561 A CN104615561 A CN 104615561A CN 201410844296 A CN201410844296 A CN 201410844296A CN 104615561 A CN104615561 A CN 104615561A
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signal
optical
transmission
sheet
mimo
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CN104615561B (en
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黄毅
王曰海
魏超
马骧
江晓清
李宇波
杨建义
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0215—Architecture aspects
    • H04J14/022—For interconnection of WDM optical networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/04—Mode multiplex systems

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses an optical interconnection transmission system on a sheet or between the plates based on a multiple-input-multiple-output technique. Signal sending nodes on the sheet or between the plates send signals, the signals pass through corresponding signal modulators and electronic optical transverters respectively, and then the signals are input in an optical signal transmission module, each output signal of corresponding channels of the optical signal transmission module passes through optical electronic transverters respectively to be connected to a multiple-input-multiple-output signal processing module, and a balance process of signals is conducted, each output signal of the corresponding channels of the multiple-input-multiple-output signal processing module passes through the corresponding signal demodulators to be connected to corresponding signal receiving nodes, the transmission of the optical signals in the optical signal transmission module adopts a module division multiplexing-demultiplexing structure, a wave division multiplexing-demultiplexing structure and a slab waveguide. The optical interconnection transmission system on the sheet or between the plates based on a multiple-input-multiple-output technique improves the transmission capacity between interconnected nodes on the sheet or between the plates effectively and reduces technological requirements of manufacturing a device simultaneously, the transmission quality is guaranteed, the performance and possibility of an optical interconnection on the sheet or between the plates are improved, and the application prospect is developed.

Description

Light network transmission system between a kind of sheet upper plate based on MIMO technique
Technical field
The present invention relates to a kind of signal transmission system, especially relate to light network transmission system between a kind of sheet upper plate based on MIMO technique.
Background technology
Along with the development of large scale integrated circuit, traditional electrical interconnection mode shows the shortcoming of the aspects such as bandwidth is low, time delay is high, energy consumption is high, anti-interference is poor gradually.And light network is due to the feature such as the high and low time delay of its bandwidth, low energy consumption, crosstalk be little, has very large potentiality in the application of future communication systems.At present, with the fast development of multiple nucleus system on plate on sheet, have higher requirement to interconnecting transfer ability, the transmission capacity further expanding light network is significant.
Technology is applied between sheet upper plate in light network to be divided by mould multiplexing, wavelength-division multiplex or planar waveguide freely to transmit etc., effectively can increase the transmission capacity of wall scroll waveguide, meet the requirement of multiple nucleus system to transmission bandwidth.In the ideal case, divide transmission system that is multiplexing or wavelength-division multiplex based on mould, do not interfere with each other at the different signal of same waveguide.But, due to the restriction of device technology in reality, always there is certain crosstalk between unlike signal, have impact on transmission quality.And multipath light signal when freely transmitting in planar waveguide, the crosstalk between signal cannot be avoided especially.Therefore transmission system proposed by the invention needs to introduce MIMO signal treatment technology and processes multiple signals, the crosstalk between erasure signal.
Summary of the invention
The object of the present invention is to provide light network transmission system between a kind of sheet upper plate based on MIMO technique, the reduction that the increase of the interconnecting transfer capacity that it realizes and device making technics require, makes on sheet or between plate, light network transmission has larger realistic meaning and application prospect.
The technical solution used in the present invention is:
The present invention includes signal modulator, electrical to optical converter, optical signal transmission module, photoelectric commutator, MIMO signal processing module and demodulator of PM signal PM, the signal that signal sending node on sheet or between plate sends is input to optical signal transmission module respectively successively after respective signal modulator and electrical to optical converter, each road output signal of optical signal transmission module is connected to MIMO signal processing module through photoelectric commutator respectively and carries out signal equalization process, each road output signal of MIMO signal processing module is connected to corresponding Signal reception node through respective demodulator of PM signal PM respectively, in optical signal transmission module, the transmission of light signal adopts mould to divide multiplexing-demux architecture, wavelength-division multiplex-demux architecture or planar waveguide.
Described MIMO signal processing module adopts carries out equilibrium treatment based on the equalization methods of training sequence or the signal of blind balance method to input.
Described signal sending node and the quantity of Signal reception node be more than or equal to arbitrarily 2 integer.
The signal madulation mode of described signal modulator is on-off keying, phase-shift keying (PSK) or quadrature amplitude modulation.
The invention has the beneficial effects as follows:
The multiplex technique such as the present invention makes full use of wavelength-division multiplex, mould divides multiplexing or planar waveguide freely to transmit, transmits multipath light signal, considerably increases the transmission capacity of wall scroll waveguide in wall scroll waveguide.For the inevitable signal cross-talk problem of wall scroll waveguide multiple signals, in electrical domain, unified MIMO signal process is carried out to multiple signals, eliminate the crosstalk between multiple signals, the transmission quality of signal is guaranteed.Meanwhile, due to the introducing of MIMO signal treatment technology, the problem that the not enough crosstalk brought of device technology level is higher can be made up, reduce the requirement to device technology, make multiplexed transmission technology more feasible.To sum up, the present invention can be widely used in and realize light network transmission system between high-speed chip upper plate.
Accompanying drawing explanation
Fig. 1 is present system structural representation.
Fig. 2 is the graph of a relation of the bit error rate and Optical Signal To Noise Ratio under embodiment different modulating mode.
Fig. 3 is the graph of a relation of the bit error rate and crosstalk under different Optical Signal To Noise Ratio in embodiment.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1, the present invention includes signal modulator, electrical to optical converter, optical signal transmission module, photoelectric commutator, MIMO signal processing module and demodulator of PM signal PM, the signal that signal sending node on sheet or between plate sends is input to optical signal transmission module respectively successively after respective signal modulator and electrical to optical converter, each road output signal of optical signal transmission module is connected to MIMO signal processing module through photoelectric commutator respectively and carries out signal equalization process, each road output signal of MIMO signal processing module is connected to corresponding Signal reception node through respective demodulator of PM signal PM respectively, in optical signal transmission module, the transmission of light signal adopts mould to divide multiplexing-demux architecture, wavelength-division multiplex-demux architecture or planar waveguide, namely transmission mode adopts mould to divide multiplexing transmission, wave division multiplex transmission or planar waveguide freely transmit.
As shown in Figure 1, signal of the present invention sends from multiple sending node, is received, process in transmitting procedure in electrical domain to signal after multiplexing transmission by corresponding receiving node, to realize the transmission of wall scroll waveguide Large Copacity.The signal that multiple signal sending node sends is through ovennodulation and the laggard optical signal transport module of electro-optic conversion, then each road signal processes respectively through entering MIMO signal processing module after opto-electronic conversion, eventually passes signal receiving and arrives corresponding Signal reception node.
MIMO signal processing module adopts the signal to input based on the equalization methods of training sequence or blind balance method to carry out equilibrium treatment.
The quantity of signal sending node and Signal reception node be more than or equal to arbitrarily 2 integer.
The signal madulation mode of signal modulator is on-off keying (OOK), phase-shift keying (PSK) (MPSK) or quadrature amplitude modulation (MQAM).
Specific embodiment of the invention process is as follows:
1) first modulate the signal that N number of signal transmitting node sends, the modulation system of signal can be on-off keying, phase-shift keying (PSK) or quadrature amplitude modulation, here N be more than or equal to 2 integer.
2) signal after modulation carries out electro-optic conversion.If optical signal transmission uses wavelength-division multiplex, then there is N number of light source; If optical signal transmission uses mould to divide multiplexing or planar waveguide freely transmit, then a use light source.
3) N road light signal enters same optical signal transmission module.If optical signal transmission uses mould to divide multiplexing, then light signal is successively through mould division multiplexer, transmission waveguide and mould decomposition multiplex device; If optical signal transmission uses wavelength-division multiplex, then light signal is successively through wavelength division multiplexer, transmission waveguide and Wave decomposing multiplexer.If optical signal transmission uses planar waveguide freely to transmit, then light signal is through planar waveguide.
4) N road light signal becomes electric signal respectively through after opto-electronic conversion, and wherein opto-electronic conversion utilizes photo-detector to realize.
5) all signals after opto-electronic conversion are unified to be entered in MIMO signal processing module, and signal processing module uses the equalization methods based on training training to process signal.
6) signal through the process of MIMO signal processing module is divided into again N road, respectively receive by the Signal reception node of correspondence.
Wherein, the signal processing method 5) used is as follows:
The transmission of multipath light signal in wall scroll waveguide can represent with transmission matrix H, in order to carry out MIMO signal process, first needs to estimate transmission matrix H.
Transmission matrix H uses LS (least square) channel estimating method to estimate, LS channel estimating method needs to minimize cost function J (H):
J(H)＝||y T-x TH|| 2＝(y T-x TH) H(y T-x TH)
Cost function is made to be 0 about the partial derivative of H, namely
∂ J ( H ) ∂ H = 0
The solution that can obtain LS channel estimating is
H LS＝x T -1y T
Wherein, H is transmission matrix, H lSfor LS estimates the transmission matrix that obtains, () hthe Hermitian conjugate of representing matrix, () -1represent inverse of a matrix, x tfor training sequence, y tfor corresponding to the Received signal strength of training sequence.
Estimate that the channel matrix obtained may be used for the equilibrium of signal.The equilibrium of signal uses the equalization methods that complexity is very low.
A, a kind of method are ZF (ZF) method.ZF method uses channel frequency response inverse of a matrix to carry out erasure signal distortion.Ideally, if system does not exist noise, ZF method can be eliminated completely between pattern and disturb (IMI).The balanced matrix of the method is as follows:
W＝pinv(H)＝(H HH) -1H H
The then balanced transmission signal obtained for:
x ^ = W · y
Wherein W is balanced matrix, and H is transmission matrix, and pinv (H) represents the pseudoinverse of H, H hrepresent the Hermitian conjugate of H.() -1represent inverse of a matrix, for the transmission signal that equilibrium obtains, y is the signal received.
B, another kind of method are MMSE (least mean-square error) method.Compared to ZF method, MMSE method can restraint speckle to a certain extent, but needs the statistical nature knowing noise and send signal.MMSE method needs to find a balanced matrix W, makes following formula minimum:
E { ( W · y - x ^ ) H ( W · y - x ^ ) }
When above formula is minimum, W can be expressed as
W = ( H H H + I δ n 2 / δ s 2 ) - 1 H H
The then balanced transmission signal obtained for
x ^ = W · y
Wherein, E represents population mean, and W is balanced matrix, and H is transmission matrix, H hrepresent the Hermitian conjugate of H, () -1represent inverse of a matrix, for the transmission signal that equilibrium obtains, y is the signal received, with noise and the variance sending signal respectively, I representation unit matrix.
Embodiments of the invention are as follows:
In order to the validity of proved inventive method light network transmission on sheet or between plate, verified by embodiment.
Embodiment 1
The structure of analogue system is same as shown in Figure 1, and optical signal transmission module uses mould to divide multiplexing-demux architecture, and signal sending node number and Signal reception nodes are 4.The signal that 4 signal sending nodes send is after the modulation of respective digital signal modulated device, and use Mach-Zehnder modulators to carry out electro-optic conversion respectively, the input light of all Mach-Zehnder modulators is provided by same light source.Light signal after 4 tunnel modulation is by mould division multiplexer, excite different patterns respectively, transmit in same transmission waveguide, and the light signal in transmission waveguide is divided into 4 corresponding road light signals by rear mold decomposition multiplex device again, is converted to electric signal respectively through photo-detector by light signal.4 road electric signal unifications enter digital signal processor and carry out MIMO signal process, process the 4 road signals obtained and are received by corresponding Signal reception node after digital signal demodulator demodulation respectively.
Embodiment 2
The structure of analogue system is same as shown in Figure 1, and optical signal transmission module uses wavelength-division multiplex-demux architecture, and signal sending node number and Signal reception nodes are 4.The signal that 4 signal sending nodes send, after the modulation of respective digital signal modulated device, uses Mach-Zehnder modulators to carry out electro-optic conversion respectively.The input light of the Mach-Zehnder modulators that every road signal electro-optic conversion uses is provided by a light source, and the wavelength of 4 light sources that transmission system uses is mutually different.Light signal after 4 tunnel modulation is by being combined into light beam after wavelength division multiplexer, transmit in same transmission waveguide, then the light signal in transmission waveguide is divided into 4 corresponding road light signals by Wave decomposing multiplexer again, is converted to electric signal respectively through photo-detector by light signal.4 road electric signal unifications enter digital signal processor and carry out MIMO signal process, process the 4 road signals obtained and are received by corresponding Signal reception node after digital signal demodulator demodulation respectively.
Embodiment 3
The structure of analogue system is same as shown in Figure 1, and optical signal transmission module uses planar waveguide, and signal sending node number and Signal reception nodes are 4.The signal that 4 signal sending nodes send is after the modulation of respective digital signal modulated device, and use Mach-Zehnder modulators to carry out electro-optic conversion respectively, the input light of all Mach-Zehnder modulators is provided by same light source.Light signal after 4 tunnel modulation enters parallel transmission in same planar waveguide, is then converted to electric signal through photo-detector by light signal respectively.4 road electric signal unifications enter digital signal processor and carry out MIMO signal process, process the 4 road signals obtained and are received by corresponding Signal reception node after digital signal demodulator demodulation respectively.
The concrete simulation parameter of above-described embodiment is arranged as follows.
One-channel signal bit rate is 50Gbit/s, and every bit sample number is 8, and sampling rate is 400GHz, and simulation time window is 5.24 μ s.The extinction ratio of Mach-Zehnder modulators is 60dB, and insertion loss is 5dB.The sensitivity of photo-detector is 1A/W, and dark current is 10nA.When optical signal transmission adopts mould point multiplexing transmission or planar waveguide freely to transmit, the frequency of light source is 193.1THz, and power is 1mW, and live width is 0.1MHz.During optical signal transmission employing wave division multiplex transmission, the frequency of 4 light sources is for being respectively 192.9THz, 193.1THz, 193.3THz and 193.5THz, and the power of 4 light sources is 1mW, and live width is 0.1MHz.Adopt the multiple-input and multiple-output equalization methods based on training sequence, channel estimating uses LS channel estimation methods, and the equilibrium of signal uses ZF method.
The simulation result of embodiment is as follows:
Fig. 2 represents when using different signal debud mode, the relation of the bit error rate of transmission system and OSNR (Optical Signal To Noise Ratio).In figure, each figure line represents implication and sees upper right side legend.
Can see the increase along with OSNR, no matter adopt which kind of signal madulation mode, its bit error rate declines all gradually.When other conditions remain unchanged, use the signal madulation of more high-order, its bit error rate rises to some extent relative to the modulation of low order.When the OSNR of actual transmissions system is higher, high-order and low-order-modulated can realize the good bit error rate.Under the prerequisite meeting the Signal transmissions bit error rate, use the signal madulation of relative high-order can realize larger transmission capacity.
When Fig. 3 represents that OSNR is respectively 14dB, 16dB and 18dB, the relation of transmission system use and crosstalk when not using MIMO signal process between the bit error rate and multiple signals.In figure, each figure line represents implication and sees upper left side legend.
Can see, when the crosstalk between multiple signals increases gradually, if do not use MIMO signal process, the bit error rate of transmission system can rise fast, makes the bit error rate be difficult to meet the needs of normal transmission.And after using MIMO signal process, although along with the increase of crosstalk, the bit error rate of transmission system also increases to some extent, and compared to not using MIMO signal process, its bit error rate has obtained larger improvement.This high crosstalk that device making technics level deficiency is brought can utilize MIMO signal treatment technology to make up.
In addition, when can notice that OSNR is lower when crosstalk is less, slightly increase when its bit error rate does not use on the contrary after using MIMO signal treatment technology, this is because ZF equalization methods can have certain amplification to noise, cause the bit error rate to increase.When OSNR is larger, even if when crosstalk is very low, use MIMO signal treatment technology still can reduce the bit error rate to a certain extent.And the OSNR of interconnection system is a higher value between sheet upper plate in reality, this makes to use MIMO signal treatment technology to have more realistic meaning.
Thus, between the sheet upper plate based on MIMO technique of the present invention, light network transmission system is in increase light network transmission capacity, reduces device technological requirement, between pushing piece upper plate optical interconnection system practical on have larger potential, there is significant technique effect.Above-mentioned embodiment is used for explaining and the present invention is described, instead of limits the invention, and in the protection domain of spirit of the present invention and claim, any amendment make the present invention and change, all fall into protection scope of the present invention.

Claims (4)

1. based on MIMO technique sheet upper plate between a light network transmission system, it is characterized in that: comprise signal modulator, electrical to optical converter, optical signal transmission module, photoelectric commutator, MIMO signal processing module and demodulator of PM signal PM, the signal that signal sending node on sheet or between plate sends is input to optical signal transmission module respectively successively after respective signal modulator and electrical to optical converter, each road output signal of optical signal transmission module is connected to MIMO signal processing module through photoelectric commutator respectively and carries out signal equalization process, each road output signal of MIMO signal processing module is connected to corresponding Signal reception node through respective demodulator of PM signal PM respectively, in optical signal transmission module, the transmission of light signal adopts mould to divide multiplexing-demux architecture, wavelength-division multiplex-demux architecture or planar waveguide.
2. light network transmission system between a kind of sheet upper plate based on MIMO technique according to claim 1, is characterized in that: described MIMO signal processing module adopts carries out equilibrium treatment based on the equalization methods of training sequence or the signal of blind balance method to input.
3. light network transmission system between a kind of sheet upper plate based on MIMO technique according to claim 1, is characterized in that: described signal sending node and the quantity of Signal reception node be more than or equal to arbitrarily 2 integer.
4. light network transmission system between a kind of sheet upper plate based on MIMO technique according to claim 1, is characterized in that: the signal madulation mode of described signal modulator is on-off keying, phase-shift keying (PSK) or quadrature amplitude modulation.
CN201410844296.5A 2014-12-30 2014-12-30 Light network Transmission system between a kind of piece upper plate based on MIMO technique Expired - Fee Related CN104615561B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108880711A (en) * 2017-05-10 2018-11-23 富士通株式会社 Estimation device, method and the receiver of interchannel linear crosstalk

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CN102307142A (en) * 2011-08-19 2012-01-04 中兴通讯股份有限公司 Back plate system
CN103428115A (en) * 2013-07-25 2013-12-04 浙江大学 Inter-board multicast optical interconnection network constructing method based on development boards

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Publication number Priority date Publication date Assignee Title
CN1523668A (en) * 2003-02-12 2004-08-25 ��ʽ����뵼����Դ�о��� Semiconductor device
CN101589319A (en) * 2006-09-19 2009-11-25 揖斐电株式会社 Optical interconnect device and method for manufacturing the same
CN102307142A (en) * 2011-08-19 2012-01-04 中兴通讯股份有限公司 Back plate system
CN103428115A (en) * 2013-07-25 2013-12-04 浙江大学 Inter-board multicast optical interconnection network constructing method based on development boards

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108880711A (en) * 2017-05-10 2018-11-23 富士通株式会社 Estimation device, method and the receiver of interchannel linear crosstalk
CN108880711B (en) * 2017-05-10 2021-04-13 富士通株式会社 Estimation device and method of linear crosstalk between channels and receiver

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